198489017 has 4 divisors (see below), whose sum is σ = 198870516. Its totient is φ = 198107520.

The previous prime is 198489007. The next prime is 198489061. The reversal of 198489017 is 710984891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710984891 = 4801 ⋅148091.

It can be written as a sum of positive squares in 2 ways, for example, as 141395881 + 57093136 = 11891^2 + 7556^2 .

It is a cyclic number.

It is not a de Polignac number, because 198489017 - 2⁸ = 198488761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198489007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189968 + ... + 191009.

It is an arithmetic number, because the mean of its divisors is an integer number (49717629).

Almost surely, 2^198489017 is an apocalyptic number.

It is an amenable number.

198489017 is a deficient number, since it is larger than the sum of its proper divisors (381499).

198489017 is an equidigital number, since it uses as much as digits as its factorization.

198489017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381498.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 198489017 is about 14088.6130261286. The cubic root of 198489017 is about 583.3271095572.

The spelling of 198489017 in words is "one hundred ninety-eight million, four hundred eighty-nine thousand, seventeen".